There are No replaceable waste cartridges required for uridan® water-free urinals. A biodegradable odour blocking fluid urilock® is poured into the waste trap and floats on the surface of the urine to create a perfect seal, blocking any urine odours. Urine flows through the urilock® and out of the waste pipe. urilock® blocking fluid remains effective for approximately 5000 –7000 visits. See Maintenance section for instructions on replacing the urilock® blocking fluid. The uridan® water-free urinal is simplicity itself. Uridan waterless urinals are being selected by organisations with a focus on sustainability and are widely used in commercial office towers, shopping mall, sporting facilities, schools, government premises. Please view our gallery for references.